It is generally not recommended to smoke after vaccination, because vaccines work by regulating immune function, and the immune system in the body will be temporarily disrupted after vaccination, which may cause fever, nausea, vomiting and allergic reactions. Tobacco contains nicotine, carbon monoxide, heavy metals and other harmful substances, which may aggravate the adverse reactions caused by the vaccine, such as fever, nausea and vomiting. In addition, some patients may have allergic symptoms such as redness, swelling, pain and itching at the site of vaccination, and smoking may lead to more serious local allergic reactions. 2. There are already studies proving that patients who smoke have a significantly higher risk of developing cancer than ordinary patients, and smoking is not recommended even for unvaccinated patients. In addition, after vaccination, it is necessary to avoid drinking alcohol and minimize the intake of spicy, seafood and other stimulating foods. Patients with severe local redness, swelling, pain and high fever can go to the hospital to identify the cause of the disease and have it treated.